>>> now to syria where the human cost of war took a very heavy, heavy toll this week. as we have been showing you, on this newscast, video surfaced of an attack that i have to warn you right now it is really just horrible beyond words. but here it is. what you're seeing what you're hearing, panicked parents, adults, carrying young children from a playground to a makeshift hospital. the scene is frantic. you can hear the shock in the voices of the parents as they cry out for help. so many children, they're injured, they're bleeding, ten of them dead. the syrian activist who posted this video on youtube say the children were killed by a cluster bomb, a device so terrible, most of the world bans the use of them. kimberly brown is a conflict adviser with save the children. she joins me now from london. i know, kimberly, you are working to confirm that the activists' claim this was or was not a cluster bomb. can you confirm that? >> i understand that groups are still working to verify this, but the evidence is very compelling, yes. >> a cluster bomb, explain it to us, it is